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Corn Plant Maturity. I. Changes in Dry Matter and Protein Distribution in Corn Plants¹

Corn plants were harvested in six stages of maturity in 1962 and eight stages in 1964 to determine the distribution of dry matter and crude protein among the leaves, stalks, and ears. Changes in dry matter from July 20 to October 14 were 14 to 36% for stalks, 19 to 79% for leaves and 10 to 62% for ears. Highest total dry matter yield per acre appeared to be between the dent and glaze stages. No vegetative growth of the leaves and stalks occurred during visible ear growth and maturation. In both years, the ears constituted over 60% of the dry matter at maturity but did not reach this level until September 12, 1962 and October 6, 1964. The crude protein content of corn leaves declined rapidly throughout ear maturation while that of the stalks declined rapidly until 15 days post-tasseling after which it declined only slightly.

² Professor, Assistant, Research Assistant, and Professor, Department of Animal Science, and Associate Professor, Department of Agronomy.

Received for publication June 30, 1965.